"asyn" provides standard mechanisms for higher level EPICS software such as device support and State Notation Language Programs to communicate with device-specific drivers. Facilities provided include connection management, threads for asynchronous devices, trace/debugging control, standard interfaces and generic device support. While “asyn” began as an effort to unify the support for “asynchronous” devices (such as RS-232, IEEE-488, and Ethernet sockets), it has recently been extended to be equally useful for synchronous devices, such as VME or PCI register-based instruments. The “synApps” software widely used for synchrotron beamline control and data acquisition is being converted to use asyn. The benefits we have realized include: - Significant reduction in the number of source files and lines of code - Better trace and debugging control - Large increase in the number of supported devices, since RS-232, GPIB and Ethernet devices are now all equivalent. - Code which used to be device-specific (for example fast feedback with the EPID record) is now device independent, provided only that a driver which implements the standard asyn interfaces is available.
Abstract File: abstract00151.txt
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